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Rounding with Percentages  
A Caution about Rounding Percentages 
Helix provides many format options for numeric values. But, when you round a number formatted as a percentage to the nearest 0.01, you may end up with unexpected results. Numbers which are formatted as a percent are multipled by 100 for display purposes only. The underlying "rate" is the number that is actually stored. Thus, 1.67% is stored as 0.0167. If you round this to thenearest 0.01, it would be displayed as 0.02 or 2.00%. This may not be the result you desire.
To correctly round a percentage, you must consistently use percentages, which means the second hole of the Round to Nearest tile should contain the value 0.01%: Or, you could round to the nearest 0.0001 if you are more comfortable dealing with the underlying rate: 